Description:Notocactus horstii fa muglianus is a form of Notocactus horstii, but not sufficiently differentiated and considered merely a local variant of the latter (if not the same). The key difference by which the two were separated, namely the presence of deeper rib with areoles more woolly and larger to 10 mm in diameter, flowers up to 5 cm wide with petals always tapering, 3-4 mm wide, orange red to salmon red, and stigma lobes coloured like the petals, seems entirely spurious. The fa mugelianus is not accepted by many botanists that treat it as synonym, but it still has a value for a collector because they identify plants with particular characters.

Subspecies, varieties, forms and cultivars of plants belonging to the Parodia ottonis group

Notocactus arechavaletae(Speg. ex Arechav.) Herter: The differences with other Parodia ottonis are minimal and most botanist agree on the fact that both should all be included in the P. ottonis. Distribution: Brazil (Rio Grande do Sul) and Uruguay (Artigas, Rivera).

Parodia ottonis var. tortuosa(Link & Otto) N.P.Taylor: has a very large body (13-18 cm), small flower (25 mm long and 25-50 mm in width) and its spines are almost equal. Distribution Brazil and Uruguay.

- The form has areoles more woolly and larger (up to 10 mm in diameter), and flowers up to 5 cm wide with petals always tapering, 3-4 mm wide, orange red to salmon red.Photo by: Alexander Arzberger

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Cultivation and Propagation: They like a warm bright location, and do great in partial shade. Avoid full sun. During winter's rest period they should be dry and cool. It is best to avoid any frost, but during the winter the temperature can be as low as 2° C without any harm, as long as the compost is very dry. They like only a short winter's rest. If the soil is allowed to be dry for too long, root loss could follow but equally the same result would occur if the plants are both wet and cold. Cold spots can mar its epidermis in cold damp conditions. They need good drainage and prefer a neutral to slightly acidic compost with plenty of extra grit and iron feed help to delay the onset of basal corking.. Water and feed during the summer. Best if watered with rain water and given an occasional tonic of sequestrated iron. A well grown plant is a fresh glossy grass- green, contrasting with reddish spines.Propagation: Usually by seeds as it seldom produces offsets.